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	<div id="winchm_template_button"><A href="_usbkd_usbhcdpow.htm" title="Previous topic"><img id="winchm_template_prev" alt="Previous topic" src="../template2/btn_prev_n.gif" border="0"></a><A href="_usbkd_usbhuberr.htm" title="Next topic"><img id="winchm_template_next" alt="Next topic" src="../template2/btn_next_n.gif" border="0"></a></div>
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<A href="introduction6.htm">Debugging Tools for Windows (WinDbg, KD, CDB, NTSD)</A> &gt; <A href="debugger_reference.htm">Debugger Reference</A> &gt; <A href="debugger_commands.htm">Debugger Commands</A> &gt; <A href="specialized_extensions.htm">Specialized Extension Commands</A> &gt; <A href="usb_2_0_extensions.htm">USB 2.0 Debugger Extensions</A> &gt; </div>
	<div id="winchm_template_title">!usbkd.hub2_info_from_fdo</div>
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	<div id="winchm_template_content"><div id="mainSection"><p>The  <b>!usbkd.hub2_info_from_fdo</b> command displays information about a USB hub.</p>
<pre class="syntax"><b>!usbkd.hub2_info_from_fdo </b><i>FDO</i></pre>
<h2><a id="ddk__devobj_dbg"></a><a id="DDK__DEVOBJ_DBG"></a>Parameters</h2>
<p></p>
<dl>
<dt><a id="_______FDO______"></a><a id="_______fdo______"></a>       <i>FDO</i>      </dt>
<dd>
<p>Address of the functional device object (FDO) for a USB hub.</p>
</dd>
</dl>
<h2><a id="DLL"></a><a id="dll"></a>DLL</h2>
<p>Usbkd.dll
     </p>
<h2>Examples</h2>
<p>Here is one way to find the address of the FDO for a USB hub. First enter <a href="#Bookmark2569"><b>!usbkd.usb2tree</b></a>.</p>
<pre class="syntax" xml:space="preserve"><code>0: kd&gt; !usbkd.usb2tree
...
2)!ehci_info ffffe00001ca11a0 !devobj ffffe00001ca1050 PCI: VendorId 8086 DeviceId 293c RevisionId 0002 
    RootHub !hub2_info ffffe000023201a0 !devstack ffffe00002320050</code></pre>
<p>In the preceding output, the address of the FDO for the hub appears as the argument of the suggested command <b>!devstack ffffe00002320050</b>. </p>
<p>Now pass the address of the FDO to the <b>!hub2_info_from_fdo</b> command.</p>
<pre class="syntax" xml:space="preserve"><code>0: kd&gt; !usbkd.hub2_info_from_fdo ffffe00002320050
usbhubext
*****************************************************************************

FDO ffffe00002320050 PDO ffffe0000213c050 HubNumber# 3
dt USBHUB!_DEVICE_EXTENSION_HUB ffffe000023201a0
!usbhublog ffffe000023201a0
RemoveLock ffffe00002320668
FdoFlags ffffe00002320ba0

CurrentPowerIrp: System (0000000000000000) Device (0000000000000000)

ObjReferenceList: !usblist ffffe00002320b70, RL 
ExceptionList: !usblist ffffe00002321498, EL [Empty]
DmTimerListHead: !usblist ffffe00002321040, TL [Empty]
PdoRemovedListHead: !usblist ffffe00002321478, PL [Empty]
PdoPresentListHead: !usblist ffffe00002321468, PL 
WorkItemListHead: !usblist ffffe00002320c80, WI [Empty]
SshBusyListHead: !usblist ffffe00002320dc0, BL 


PnP FUNC HISTORY (latest at bottom)
----------------------------------------
01. IRP_MN_QUERY_DEVICE_RELATIONS
...

POWER FUNC HISTORY (latest at bottom)
--------------------------------------------------
01. IRP_MN_QUERY_POWER    - PowerSystemHibernate
...

HARD RESET STATE HISTORY (latest at bottom)
----------------------------------------------------------------------------------------------------
    EVENT                           STATE                                   NEXT
----------------------------------------------------------------------------------------------------
01. HRE_Pause                       HReset_WaitReady                        HReset_Paused                           
...

PNP STATE HISTORY (latest at bottom)
----------------------------------------------------------------------------------------------------
    EVENT                           STATE                                   NEXT
----------------------------------------------------------------------------------------------------
01. Ev_SYSTEM_POWER                 FDO_WaitPnpStop                         FDO_WaitPnpStop                         
...

POWER STATE HISTORY (latest at bottom)
----------------------------------------------------------------------------------------------------
    EVENT                           STATE                                   NEXT
----------------------------------------------------------------------------------------------------
01. Ev_SET_POWER_S0                 FdoSx_Dx                                FdoWaitS0IoComplete_Dx                  
...

BUS STATE HISTORY (latest at bottom)
----------------------------------------------------------------------------------------------------
    EVENT                           STATE                                   NEXT
----------------------------------------------------------------------------------------------------
01. BE_BusSuspend                   BS_BusPause                             BS_BusSuspend                           
...

SSH_EnabledStatus: [SSH_ENABLED_VIA_POWER_POLICY]

SSH STATE HISTORY (latest at bottom)
----------------------------------------------------------------------------------------------------
    EVENT                           STATE                                   NEXT
----------------------------------------------------------------------------------------------------
01. SSH_Event_ResumeHubComplete     SSH_State_HubPendingResume              SSH_State_HubActive                     
...

PORT DATA
-------------------------------------------------------------------------------------------------------------------
PortData 1: !port2_info ffffe000021bf000 Port State = PS_WAIT_CONNECT PortChangeLock: 0, Pcq_State: Pcq_Run_Idle             
     PDO 0000000000000000 
...</code></pre>
<h2><a id="see_also"></a>See also</h2>
<dl>
<dt><a href="#Bookmark2553">USB 2.0 Debugger Extensions</a></dt>
<dt><a href="http://go.microsoft.com/fwlink/p?LinkID=227351">Universal Serial Bus (USB) Drivers</a></dt></dl></div></div>	
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